Process of producing aromatic hydrocarbons.



R. 1. HILL. PROCESS OF PRODUCING AROMATIC HYDROCAR BONS. APPLICATIONFILEDJULY 26,1915. fiENEWED MgiR. 28.1918.

Patentd June 11, 1918.

and

ROY LINDEN HILL, OF CHESTER, PENNSYLVANIA, ASSIGNOR T0 E. I. no POINT nuN'EIWOUES PQWDER COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION 01? NEWJERSEY.

PROCESS OF PEQJDUGI NG AROMATIC HYDROCABBONS.

. rece es.

specification of Eetters Patent.

Patented dune rag-rare Application filed July 26, W15, Striallto. 41mm.Renewed March at, 1918; serial No. 2%,W0.

matic compounds, but it is especially appli-,

cable to the production of benzol and toluol from solvent naphtha orheavy naphtha.

Ithas been before known that when such mixtures are passed through tubesmaintained at a high temperature, either at atmospheric or a higherpressure, decomposition takes place so that the condensate when obtainedcontains a certain percentage of benzol-and toluol.

The object of my invention is to increase the percentage of low boilingaromatic hydrocarbons, as for example, benzol and toluol, in processesof the above character.

In general, my invention relates to a proc ess in which in the heatedtubes, through which the higher boiling. aromatic com pounds are passed,there ,is provided a body of a carbid, such for example as barium car'bid or calcium carbid. This results in an increased production ofbenzol and toluol in the condensate obtained.

While my invention may be carried out in connection with many diderentforms of apparatus, for the purpose of illustration, I have shown onlyone form of apparatus in the accompanying drawings, in which,

The figure is a diagrammatic side elevation of an apparatus which may beused for carrying out myinvention.

In the drawings l have shown a container 1, which is adapted to besupplied with a body of a higher boiling aromatic hydrocarbon, such forexample as solvent na htha or heavy naphtha through a funne 2 attachedto the container 1 and havin .a

' hand-valve 3. The container 1 is provi ed with an outlet pipe 4,leading into a tube 5,

said pipe 4 having a hand-valve 6. Said container 1 is, furthermore,provided with an an pressure supply pipe 7 having a handvalve 8, and avent pipe 9 provided with a valve 10, and an equalizer pipe 11 having avalve 12. The tube 5 is preferably provided with a body of a carbid 13,which may for example be barium carbid or calcium carbid, which isdistributed along the bottom of the tube 5 and is arranged to passthrough a furnace 14:, which may be heated in any desired manner. Theoutlet end of the tube 5 is connected to a coil 15 of a condenser 16,said coil 15 having at its inlet end a handvalve 17, and at its outletend a hand-valve 18. The container 1 is preferably provided with aliquid gage 19.

In the operation of my process, a body of solvent naphtha or heavynaphtha is fed into the container 1 through the funnel 2, the valves 3and 10 being open but the valves 6, 8 and 12 being closed. When thefeedin of the naphtha into the container 1 has een completed the valves3 and 10 are closed and the body of material in the container isfedoutwardly through the pipe 4 by opening the valves 6 and 8 andapplying air pressure to the body of liquid in the container 1, ifdesired, through the pipe 7, or

by opening the valve 12 in the equalizer pipe 11, with valve 8 closed,thus dispensing with air pressure. As soon as the naphtha reaches thetube 5, which is referably maintained above 500 (3., and t e mostsuitable temperature of which is 600 (3., it is volatilized and it thenpasses through the tube 5 in the form of vapor over the body of thecarbid 13. The pressure within the tube 5' may be controlled, and ispreferablymaintained above the atmospheric pressure by the valve 17. Thevapor thus produced, as it passes out of the'tube 5, is conducted to thecondensing coil 15, the pressure in which is controlled by the valve 18.A condensate is thus obtained at the outlet end of the coil 15 whichcontains bBIlZOl and toluol in larger 4 percentages than previouslyobtainable in processes of this type.

While I have described my invention above in detail, it is to beunderstood that many of the details oi the process given .13. Theprocess which comprises heating, 65

above may be varied without departing from the spirit of my invention.For example,

the method of introducing the naphtha and of condensing the gasesmaybevaried as desired and'thc same is true of the kind-of apparatus used,particularly the size and shape of the tube, and the means used foreheating the same. I I claim a 1. The process which comprises heating anaromatic hydrocarbon in the presence of an alkaline earth metal carbid,so as to produce a. lower boiling hydrocarbon.

2. The process which comprises heating an aromatic hydrocarbon havingahigher l boiling oint than toluol, in the presence of an alka 1ne earthmetal carbid so as to pro- 'duce a lower boilinghydrocarbon.

3. The protess which comprises heating heavy naphtha in the presence ofan alkaline earth metal carbid, so as to produce a lower boilin Ighydrocarbon.

4. he process which comprises heating an aromatic hydrocarbon in thepresence of calcium carbid, so as to produce a lower boilin hydrocarbon.

5. The process which comprises heating an aromatic hydrocarbon having ahigher boiling point than toluol, in the presence of calcium carbid soas to produce a lower boilinlg hydrocarbon.

6. he process which comprises heating heavy naphtha in the presenceof'calciumcarbid so as to produce a lower boiling hydrocarbon.

7 The process which comprises heating to above 500 C. an aromatichydrocarbon in the presence of "an alkaline earth metal carbid so as toproduce a-lower boiling hydrocar 11.

- 8. The prdcess which comprises heating to above 500 C. an aromatichydrocarbon,

. having a higher boiling point than toluol,

lower boilinghydrocarbon.

in the presence of an alkaline earth metal carbid so as to produce alower boiling hydrocarbon.

9. The process which comprises heating to above 500? C. heavy naphtha inthe presence of an alkaline earth metal carbid, so as to produce a lowerboiling hydrocarbon.

10. The process which comprises heating to above 500 C. an aromatichydrocarbon in the presence of calcium carbid so as to produce a lowerboilin hydrocar on.

11. The process whic comprises heating to above 500 C. an aromatichydrocarbon,

having a higher-boiling point than toluol,

in the presence of calcium carbid so as to produce alower boilinhydrocarbon.

12. The process whic Lcomprises'heating to above 500 C. heavy naphtha inthe presence of calcium carbid, so as to produce a.

than toluol,

at a pressure greater than the atmospheric pressure, an aromatichydrocarbon 1n the presence of 'an alkaline earth metal carbid, so as toproduce a lower boiling hydrocarbon.'

14-. The process which comprises heating, at a pressure greater than theatmospheric pressure, an aromatic hydrocarbon, having a higher boilingpoint than toluol, in-the presence of an alkaline earth metal carbid soas to produce a lowerboiling hydrocarbon. if

15. The process which comprises heating, at a pressure greater than theatmospheric pressure heavy naphtha in the presence of an alkahne earthmetal carbid, so as to produce a lower boiling hydrocarbon.

16. The process which comprises heating, at a pressure greater than theatmospheric pressure, an aromatic hydrocarbon in the presence of calciumcarbid, so as to produce a lower boiling hydrocarbon.

17. The process which comprises heating, at a pressure greater than theatmospheric pressure, an aromatic hydrocarbon, having a higher boilingpoint than toluol, in the presence of calcmm carbid so as to produce alower boiling hydrocarbon. 18. The process which comprises heating, at apressure greater than the atmospheric pressure, heavy naphtha in thepresence of calcium carbid, so as to produce a lower boilinghydrocarbon.

19. The process which comprises heating to above 500 C. at a pressuregreater than the atmospheric pressure, an aromatic hydrocarbon in thepresence of an alkaline earth metal carbid, so as to produce a lowerboilin hydrocarbon. 4

20. he process which comprises heating to'above 500 0., at a pressuregreater than the. atmospheric pressure, an aromatic hydrocarbon, havinga higher boiling point than toluol, in the presenceof an alkaline earthmetal carbid so as to produce a lower boilin hydrocarbon.

21. he process which comprises heating to above 500 (3., at a pressuregreater than bid was to produce 'a lower boiling hydrocar 11.

'22. The process which comprises heating I the atmospheric pressure,anaromatic hydrocarbon in the resence of calcium-carbid, so as to prouce a lower boiling hy-' drocarbon. a 23. The process which comprisesheating to above 500 (3., at a pressure greater than the atmosphericpressure, an aromatic hydrocarbon having a higher boiling point in thepresence of calcium carbid to above 500 C. at a pressure greater than soas to produce a lower boiling hydro. In testimony that I claimtheforegoing I carbon. h have hereunto set my hand.

24. The process w ich comprises heating to above 500 0., at a pressuregreater than ROY LINDEN HILL 5 the atmospheric pressure, heavy naphthain Witnesses:

the presence of calcium carbid, so as to pro- CHAS. G. WoRmLoW,

duce a lower boiling hydrocarbon. FLETCHER B. HOLMES.

